Noureddine El Alami

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About

Noureddine El Alami is a researcher whose work lies at the intersection of nonlinear dynamics, hybrid systems, and bipedal robotics. His research focuses on the challenging problem of achieving stable, efficient locomotion in legged robots, particularly through the analysis and control of periodic gaits. A key contribution is his work on the Lyapunov stability of hybrid system limit cycles, where he proposed a novel technique combining Lyapunov’s direct method with linear matrix inequalities (LMIs) to rigorously analyze the stability of a compass-like biped robot—a system characterized by continuous dynamics punctuated by impulsive foot impacts. This approach provides a formal framework for ensuring stable walking, a critical step toward practical bipedal robots. In related work, El Alami explored optimal gaits for the same compass-gait model, using a passivity-based control strategy to investigate how a robot can naturally select a walking speed that maximizes energy efficiency for a given ground slope. While his most-cited paper, “Stable Periodic Gaits of N-Link Biped Robot in Three Dimensional Space,” has garnered 8 citations, his cumulative work offers foundational insights into the stability and efficiency of underactuated walking robots.